更新采购订单、发货、合同查询、盘点、入库和配置文件，新增零改单和文档

docs/preview-server.js

@@ -0,0 +1,22 @@
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+const root = __dirname;
+const types = { '.html': 'text/html; charset=utf-8', '.png': 'image/png', '.css': 'text/css; charset=utf-8', '.js': 'text/javascript; charset=utf-8', '.md': 'text/plain; charset=utf-8' };
+const server = http.createServer((req, res) => {
+  try {
+    const url = new URL(req.url, 'http://127.0.0.1:18765');
+    const rel = decodeURIComponent(url.pathname).replace(/^\/+/, '');
+    const filePath = path.resolve(root, rel);
+    if (!filePath.startsWith(path.resolve(root))) {
+      res.writeHead(403); res.end('Forbidden'); return;
+    }
+    fs.readFile(filePath, (err, data) => {
+      if (err) { res.writeHead(404); res.end('Not found: ' + filePath); return; }
+      res.writeHead(200, { 'Content-Type': types[path.extname(filePath).toLowerCase()] || 'application/octet-stream' });
+      res.end(data);
+    });
+  } catch (e) { res.writeHead(500); res.end(String(e)); }
+});
+server.listen(18765, '127.0.0.1', () => console.log('preview server on 18765'));
+setInterval(() => {}, 1000);